MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Shelled amoeba and sphagnum moss. Darkfield illuminated polarised light micrograph of an Arcella sp. testate (shelled) amoeba (round), amongst Sphagnum sp. moss leaves (bottom ant top). The circular shell of this amoeba is formed from the polysaccharide chitin. Arcella are found in freshwater ponds and puddles. They can develop vacuoles of carbon dioxide in their body to float up to the water's surface. Magnification: x200 when printed 10 centimetres wide.
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